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SITE REMEDIATION <br /> Construction of a sort and groundwater remediation system was completed at the site in December <br /> 1999 The remediation system consists of seven soil vapor extraction (SVE) wells (W-1, W-3 <br /> through W-8), two groundwater monitor wells modified for SVE (MW-1 and MW-3) and four air <br /> sparge wells (AS-1 through AS-4) with catalytic oxidation treatment A Site Plan depicting the <br /> locations of the remediation wells, subsurface piping, and remediation equipment compound is <br /> included as Figure 4 Initial start-up air discharge compliance testing was completed on December <br /> 13, 1999 The San Joaquin County Valley Air Pollution Control District(SJVAPCD)has approved <br /> an air permit for the site During site visits, SECOR monitored system parameters and collected <br /> appropriate influent soil vapor samples <br /> Based on the influent soil vapor samples analytical results, approximately 1,858 pounds of gasoline <br /> were removed and treated at an average extraction rate of 189 scfm for this reporting period A total <br /> of approximately 31,539 pounds of gasoline has been removed and treated at the site since the SVE <br /> system began operation The soil vapor analytical results and system efficiency results are included <br /> as Attachment III <br /> FORTHCOMING ACTIVITIES <br /> During the second quarter of 2001, SECOR will conduct additional monitoring, sampling and <br /> remediation system operation and maintenance activities The results of these activities will be <br /> summarized in a quarterly monitoring report to be submitted to you in July 2001 <br /> This report presents our understanding of existing conditions at the subject site The conclusions <br /> contained herein are based on the analytical results and professional Judgment which are in <br /> accordance with current standards of professional practice, no other warranty is expressed or <br /> implied SECOR assumes no liability for exploratory borings or data reported by other consultants <br /> or contractors <br /> Sincerely, <br /> SECOR International Incorporated <br /> [ o <br /> No.E063 <br /> �E s <br /> r <br /> Todd J Brown kbit E Bower, R G OFC <br /> \ <br /> Project Geologist Principal Geologist <br /> TJBIJEB tb <br /> Attachments <br /> cc Harlin Knoll, San Joaquin County Public Health Services <br /> Elizabeth Thayer, California Regional Water Quality Control Board <br /> SECOR <br /> C Slime liefordQ101 � ApH 16 2001 <br /> 077 617377 003 OOJ <br />